dvd sound recording gaps

Guest

Hi i have a superb panasonic dmre-55 dvd recorder. This has made my vhs recorder redundant.I have had no trouble at all until this week, when recording two afternoon films on channel 5.On both films, which were recorded on differant days there is no sound between the first and second commercial breaks.This knocks about 15-20minutes out of your film and makes it unwatchable.Both were recorded from channel 5 off sky.
Can anyone help please?